Looking for fairly small remote that can learn codes for my Logitech UE Smartradio.

Figure I need something with:

Channel up down-for next/prev track
Volume up down-for volume
number pad 1-9- for Preset 1-6 stations
mute button

Play and stop would be bonus, but small and light is bonus too.
Mutifunction learning keys would be bonus to learn other features, but not essential.

Waterproof would be huge bonus, since for bathroom remote, but expect this will be asking too much.

Currently have MX-500 that works all functions seemlessly for this radio, but is a bit too big for just this one function.

Thanks